HDHacker is a stand-alone micro-util that saves, visualizes, restores the MBR (from a physical drive), the BootSector (from a logical drive) or any sector from a disk too. An MBR and BootSector backup can be useful for simple precautionary purposes, in fact sometimes viruses or other SO (Linux) setup could overwrite them and/or alter them, making it impossible to start up previous SO and/or have access to data stored on the disk.